Detachable handle



Nov. 14, 1933. E. w. STEVENS 1,935,065

DETACHABLE HANDLE Filed July 21, 1931 2 SheetsSheet l [NI/ENTOR.

Edward W. 57evens jymxmm A TTORNE Y NOV. 14, 1933. E w STEVENS 1,935,065

DETACHABLE HANDLE Filed July 21, 1951 2 Sheets-Sheet 2 INVENTOR. EdwardSfevens ATTORNEY.

Patented Nov. 14,1933 I V 1,935,o65 Y DETACHABLE HANDLE Edward W.Stevens, Detroit, Mich., assignor to Chicago PneumaticTool Company, NewYork,

" N. Y., a corporation of New Jersey Application 11 113" 21, 1931.,Serial No."552,187 15 Claims. (01. 121-36) This invention 'relates'topercussive power tools and'more particularly to auxiliaryhandles'therefor-which can be conveniently attached a'nd'detached.n-One. object. of the invention is to extend the usefulness and increasethe adaptability of percussive .130013 of the hand supported type.Anothervobjectisto permit the application of great-'- er force when thetoolis in :contact with the work. Another object is to provide forconvenient oscillation of the'tooldrilling operations. Still anotherobject is-zto devise a detachable head of the cross head of T typeadapted for light hand tools and usable with or without a push plate.Other objects will be apparent from the detailed descriptionwhichfollows. :1 I

By the use of ,a detachable handle of the presentinventionjincombination with-a light weight percussive tool of the typecommonlyreferred to as coal-picks, the utility of the'tool is greatlyincreased. .In coal mining, for example, the general ated and by drivinginto thecoal vein-at an-angle,

pieces-ofcoal. will be broken out rapidly. With one manto shovel theloose coal back into a Waitingmine cara greatertonnagecan be producedthan by the formenmethod of drilling and blasting,- mainly because notime is lost waiting for the drift toclear of smoke and gas causedby'the explosions. i

After the coal has been cutaway to a substantial depth, as some twelvefeet, it becomes necessaryv to remove ,the underlying stratum of slatein order to bring the mine cars up to the working faceJ. Drilling andblasting is the quickest meth- 0d and for thedrilling, thedetachablercrossihandleand push'plate'ofthe present invention may be'applied. to the'coal pick: hammer. -The peg point steel isremovedand a'drill steel'about twelve'feet'long is substituted. These changes convertthe tool into a hand rotated rock drill which can be easily operated byone man. Thus where two different types of machines were formerly used,one will now do the work so'that with: a hollow grip portion c.

there is not only a saving'intime but the capital investment is reducedat least 50%, without consideringthe'economies in maintenance.

Additional uses for light percussive tools after application ofthe'detachable handle are in hitch cutting, demolition work, tietamping, clay spading, and the like.

where considerable pressure is required to feed the drill. Hence it isconveniently removable from the handle attachment. The push plate isarr'angedto swivel freely at its point of attachmentand may beapplied'a'gainst chest, thigh or kneesi In order to illustrate theinvention concrete embodiments thereof 'areshown in the accompanyingdrawings, in which: i k

Fig. 1 is a side elevational view of a percussive tool withone form ofthe invention, the detachable handle and the cooperating part of thetool being shown partly in section; Fig. 2 is a top plan view of thepartsrshown in Fig. 1;

The'push plate is normally .used only in such cases as horizontaldrilling Fig. 3 is a view-similar to Fig. l-but showing a modified formof the invention, partly in section, applied to'the handle portion, alsoin sectiornof a different form of percussive tool;

Fig. 4 is a plan view of the handle shown in Fig. 3 withthe push platemember r'emoved; and "Fig. 5 is a side elevational view of the pushplate member for the handle shown in Figs. 3 and4.

In Figs. 1 and 2, one form of detachable handle is disclosed as appliedto a push-handle type of light weight percussive tool comprising a cylinder A, having: a working tool B, such as a peg point or .drill steel,inserted in its forward end and held in operative relation with a hammerpiston (not shown) by a coil spring retainer C.

The backhead member D of thedrillhas an axially movable element Eproviding a handle If pressure-is applied to element E it movesforwardon member D and actuates a throttle valve (not shown) for 4admitting motive fluid, such as compressed air,'to operate the hammer.Such a tool and its manner of operation is well known, the toolshowncorre-- sponding substantially to the disclosure of U.'S. Patent No.739,609, issuedSeptember 22, 1903 to H. G. Kotten.

"The detachable-handle adapted to beapplied to the tool described abovecomprises a substantiallyaslraight member fi providing hollow gripportions '7 and 8 and enlarged central portion 9 having socketlo shapedto fit and to receive the grip portion e of the percussive tool. Bore 11of handle Slines up and registers with the bore in grip portion e whenthe detachable handle is applied to permit the insertion of a lockingmember, such as a pin 12, which is inserted through grip portion '7through a bore of grip portion e of the hammer, and within grip portionof the detachable handle 8. The head 13 of pin 12 may havescrew-threaded connection with bore 11 to secure the locking pin againstaccidental removal. Central portion 9 of handle 6 has an extension 14 inthe form of a boss over which telescopes the sleeve portion 15 of a pushplate 16. The push plate is arranged to swivel on boss 14 and is freelyremovable therefrom. A spring ring 17 in a groove in extension 14 mayprovide frictional resistance to its removal.

The modified form of detachable handle shown in Figs. 3, 4 and 5, isshown in Fig. 3 as applied to a somewhat different but common type oflight percussive tool F provided with a manually controlled throttlevalve G and having a hand control H on the hammer cylinder for closingthe main exhaust port to .blow cuttings out of a drill hole when ahollow drill steel is used as the working tool. The backhead I forhammer cylinder F carries throttle valve G and provides a throttle leverJ having its handle end disposed adjacent hollow-grip portion 2'whichforms a part of backhead I, so that when the grip portion isgrasped by the operator throttle lever J can be convenientlymanipulated. Grip portion i has a slot i intersecting the bore thereofand in line with throttle lever J for a purpose presently to bedescribed. Detachable handle 6 conforms in major respects to the formshown in Figs. 1 and 2 in that it has end grips l -and 8 a large centralportion 9 providing a socketlO shaped to fit and receive grip portion 2'of backhead I, an'extension or boss 14 and a push plate 16 removablymounted on boss 14 In this instance pushplate 16 has a stud 15 having aprojecting portion which telescopes within a bore in boss 14*. Theeffect is that the push plate 16 will swivel upon handle 6 insubstantially the same manner as push plate 16 on handle 6 of the firstform of the invention,

Different means are used to secure handle 6 in place as compared withthe first form of the invention through the necessity of some means onthe detachable handle for operating throttle lever J. The locking meanscomprise plungers 18 mounted in grip portions '7 and 8 and having theirends projectable into socket 10 to engage the bore of handle portion 2'.Plungers 18 are yieldingly retained in extended or locking position bycoil springs 19 encircling reduced portions ofthe plungers and mountedin counterbored portions of handle bore 11 Plungers 18 have bearings inperforated plugs 20 and buttons 21 on their outer. ends by which theymay be retracted when handle 6* is to be applied or to be removed. Inorder to actuate throttle lever J, a lever 22 is pivotally mounted uponcentral section 9 with its actuating end 22 extending throughregistering slots 23 and 2' to engage lever J and with its handleportion 22 adjacent grip portion A for convenient operation by the handwhich grips the end 8 From the above the manner of mounting and removingdetachable handle 6 or 6 will be obvious. When either handle is inplace," light percussive tools such as A and F arereadily adapted todrilling and sinking operations inasmuch as ample leverage is given byaligned grip portions neeaoes 7, 8 and 7 8 for oscillating the entiretool, and consequently the drill steel, to prevent sticking of thelatter. With a push handle tool, such as A, control of the motive fluidis effected by pressure on handle 6. When the invention is applied to atool, such as F, with an inside throttle lever, operation'of the latteris efiected by an actuating lever, such as 22, on-handle 6 If heavypressure is required to feed the drill steel, push plate 16 or 16'* isapplied to the detachable handle for application against some part ofthe operators body. Since the push plate swivels freely on thedetachable handle, the push plate does not interfere with oscillation ofthe T handle to speed up the drilling.

I claim as my invention:

1. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse to the axis ofsaid tool, of a detachable handle member having a socket receivingsaid'extension and means engaging said bore to secure said member inplace.

2. The combination with a light weight percussive tool having a backhead'and an extension thereon having a boretransverse to the axis ofsaid tool, of a detachable handle member'having a socket receiving saidextension, and. means en gaging said bore from opposite ends thereof tosecure said member in place. 7

3. The combination with a light weight per cussive tool having a backhead and an extension thereon having a bore transverse to the axis ofsaid tool, of a detachable handle memberhaving a socket receiving saidextension, and a bore registering with said back head bore, and alocking pin extending into both bores to secure said member in place.

4. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse to the axis-ofsaid tool, of a detachable handlemember having a socket receiving saidextension, and a bore registering with'said back head bore, a lockingpin extending into both bores to secure said member in place, and meanssecuring said pin to said member.

5.. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse to the axis ofsaid tool, of a detachable handle member having a socket receiving saidextension, and a bore registering with said back head bore, and means insaid bore of said member for engaging'said back head bore to secure saidmember to said tool.

6. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse'to the axis ofsaid tool, of a detachable handle member having a socket receivingsaidextension, and a bore registering with said back head bore, andmeans in said bore of said member engaging said back head bore fromopposite ends to secure said member to said tool.

'7. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse to the axis ofsaid tool, of a detachable handle member having a socket'receiving saidextension, and a bore registering with said back head bore, and springpressed plungers in said bore of said member extending into said socketto engage said back head bore from both sides securely. to lock saidmember to said tool.

'8. The combination with a light weight percussive tool having a backhead and an extension thereon having a bore transverse to the axis ofsaid tool, of a detachable handle member having a socket receiving saidextension, and a push plate mounted for swivelling movement on saidmember above said socket and detachable therefrom.

9. The combination with a light Weight percussive tool having aback headand an extension thereon having a bore transverse to the axis of saidtool, of a detachable handle member having a socket receiving saidextension, said member having a boss above said socket, and a push platedetachably mounted for swivelling movement on said boss.

10. In combination,. a light percussive power tool having a grip handlewith an end recess thereinQand a detachable T handle comprising asubstantially straight member having grip portions at its ends and acentral portion provided with a socket to fit over and receive the griphandle of the tool, and means toengage the recess in the grip handle tosecure the detachable handle to the latter. Y

11. In combination, a light percussive power tool having a grip handlewith an end recess therein, and a detachable T handle comprising asubstantially straight member having anaxial bore, grip portions at itsendsand a central por-,

tion formed with a socket to fit over and receive the grip handle of thetool, and means Withinsaid axial bore projectable into said socket forengagement with the recess in said grip handle to secure the detachablehandle to the latter.

12. In combination, a light percussive power tool having a grip handlewith an end recess therein, and a detachable T handle comprising asubstantially straight member having hollow grip portions at its endsand acentral portion formed with a socket to fit over and receive thegrip handle of the tool, and retractable springpressed plungers withinsaid grip portions extending into said socket toengage the recess insaid grip handle to secure the detachable handle to the latter.

13. In combination, a light percussive power' tool having a grip handlewith. an end recess therein, and a detachable T handle comprising asubstantially straight-member having hollow grip portions at its endsand a central portion formed with a socket to fit over and receive thegrip handle of the tool, and retractable springpressed plungers withinsaid grip portions extending into said socket to engage the recess insaid grip handle to secure thedetachable handle to the latter, and meansmounting a detachable push plate for swivelling movement upon saidcentral portion.

14. In combination, a light percussive power tool having a grip handlewith an end recess therein, and a detachable T handle comprising asubstantially straight member having hollow grip portions at its endsand a central portion formed with a socket to fit over and receive thegrip handle of the tool, and retractable spring-pressed plungers withinsaid grip portions extending into said socket to engage the recess insaid grip handle to secure the detachable handle to the latter, saidcentral portion having a slot therethrough, an actuatinglever pivoted tosaid central portion and extending through said slot and transversely ofsaid socket.

15. In combination, a light percussive power tool having a grip handlewith an end recess therein, and a detachable T handle comprising asubstantially straight member havinghollow grip portions at its ends anda central portion 1 5 formed with a socket to fit over and receive the;grip handle of the tool, and retractable spring pressed plungers withinsaid grip portions extending into said socket 'to engage the recess insaid grip handle to secure the detachable handle to the latter, saidcentral portion having a slot therethrough, an actuating lever pivotedto said centraliportion and extending throughsaid slot and'transverselyof said socket, the handle of said lever extending over one of said gripportions, a boss on said central portion, and a push plate having a studfor telescoping engagement with said boss for mounting said plate onsaid handle for swivelling movement.

EDWARD W. STEVENS.

